Fieldpiece STA2 - In Duct Hot-wire Anemometer User Manual download pdf (Page 2)

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Execute the Traverse

1. Determine the appropriate measurement

points by measuring either the diameter of

the duct or the width and height. Then use the

appropriate table (See table 1 and 2) to calculate

the insertion depth where each of the point

measurements should be recorded.

2. Insert the probe of the STA2 into the duct and

use the at edges of the probe to position the

probe tip so air ows directly past the sensor.

Check that the direction of airow is at 90° to the

probe by making sure that the wand itself is at a

right angle to the side of the duct.

90°

3. Use the laser etched ruler on the side of the

probe to measure the insertion depth and nd

the locations you determined in step 1.

4. Press the ENTER button to record a point

measurement at each of the locations

determined in step 1.

5. Press the Average button to display the

calculated average of all recorded points. Then

use the arrow buttons to cycle display between,

average temperature, velocity and airow.

Proper Measurement

Points for Rectangular/

Square Ducts

TABLE 1

Traverse locations using log-Tchebyche rule in a rectangular duct

Length of Side # of Traverse Lines Distance from Inner Wall in % of Length of Side

< 30 in (76 cm) 5 7.4%, 28.8%, 50%, 71.2%, 92.6%

30-63in (76-160cm) 6 6.1%, 23.5%, 43.7%, 56.3%, 76.5%, 93.9%

>63in (160cm) 7 5.3%, 20.3%, 36.6%, 50%, 63.4%, 79.9%, 94.7%

Proper Measurement

Points for Round Ducts

TABLE 2

Log linear rule for traverse points on two diameter for a round duct

Diameter # of points per diameter Distance from inner wall in % of diameter

<10in (25.4cm) 6 3.2%, 13.5%, 32.1%, 67.9%, 86.5%, 96.8%

≥ 10in (25.4cm) 10 1.9%, 7.7%, 15.3%, 21.7%, 36.1%, 63.9%

Speciﬁcations

Accuracy: Stated accuracy @ 73°F±9°F (23°C±5°C),

<90%RH

Temperature coecient: 0.1 x (specied accuracy)

per °C for 0°C to 18°C, 28°C to 50°C (32°F to 64°F,

82°F to 122°F)

Operating environment: -4°F to 122°F (-20°C to

50°C) at <75%RH

Storage temperature: -4°F to 140°F (-20°C to 60°C),

0 to 80% RH (with battery removed)

Battery: 9V

Battery life: 20-35 hours approx. (alkaline)

Battery indication: is displayed when the

battery voltage drops below the operating level.

Auto Power o: after 15 minutes of inactivity if APO

is active.

Over range: "OL" or "-OL" is displayed

Dimensions: 7.2 in (H) x 2.5 in (W) x 1.3 in (D)

[185mm (H) x 65mm (W) x 35mm (D)]

Weight: 12 oz. (340g) including battery

Velocity

Sensor type: Micro-glass bead thermistor.

Resolution: 1 fpm (0.01 m/s)

Range: 40-3960 fpm (0.20-20.00 m/s)

Accuracy: ± (5%+1 dgt) reading or ± (1%+1dgt)

full scale

Units: fpm, m/s, km/hr, mph

Temperature

Sensor type: Thermistor

Range: -4°F to 140°F (-20°C to 60°C)

Resolution: 0.1°C, 0.1°F

Accuracy:

±1.0°F for 32°F to 113°F

±2.0°F for -4°F to 32°F, 113°F to 140°F

±0.5°C for 0°C to 45°C

±1.0°C for -20°C to 0°C, 45°C to 60°C

Maintenance

Clean the exterior with a dry cloth.

Do not use liquid.

Battery Replacement

When the meter displays the

battery should be replaced. Turn your

STA2 o and replace with 9V battery.

Protecting the Sensor

The STA2 uses a delicate glass bead

thermistor sensor. When not in use it

is best to protect this sensor with the

vinyl slip cover included with the STA2

and keep it stored in the provided

blow molded case.

Optional Accessory

RCONE1 being used

to hold the STA2

probe in place in

round duct.

Limited Warranty

This meter is warranted against

defects in material or workmanship

for one year from date of purchase.

Fieldpiece will replace or repair the

defective unit, at its option, subject to

verication of the defect.

This warranty does not apply

to defects resulting from abuse,

neglect, accident, unauthorized repair,

alteration, or unreasonable use of the

instrument.

Any implied warranties arising

from the sale of a Fieldpiece product,

including but not limited to implied

warranties of merchantability and

tness for a particular purpose, are

limited to the above. Fieldpiece shall

not be liable for loss of use of the

instrument or other incidental or

consequential damages, expenses, or

economic loss, or for any claim of such

damage, expenses, or economic loss.

State laws vary. The above limitations

or exclusions may not apply to you.

For Service

In the USA, call Fieldpiece

Instruments for one-price-x-all out of

warranty service pricing. Send check or

money order for the amount quoted.

Send the meter freight prepaid to

Fieldpiece Instruments. Send proof

of date and location of purchase for

in-warranty service. The meter will be

repaired or replaced, at the option of

Fieldpiece, and returned via least cost

transportation. Outside of the USA,

please visit www.eldpiece.com for

service contact information.

www.eldpiece.com

©Fieldpiece Instruments, Inc 2011;v19

6. If the above steps were followed, the average

ow number on your STA2 will be an accurate

representation of the airow through the

traverse location you selected.

7. (Optional) More is better. If the traverse location

you have selected is not ideal for any of the

reasons listed above, it may be benecial to

conduct multiple traverses at dierent locations.

90°

D (<10”)

D (>10”)

0.032D

0.135D

0.321D

0.679D

0.865D

0.968D

0.019D

0.077D

0.153D

0.217D

0.361D

0.639D

0.061W

0.235W

0.437W

0.563W

0.765W

0.939W

0.926H

0.712H

0.500H

0.288H

0.074H

0.783D

0.847D

0.923D

0.981D

90°

D (<10”)

D (>10”)

0.032D

0.135D

0.321D

0.679D

0.865D

0.968D

0.019D

0.077D

0.153D

0.217D

0.361D

0.639D

0.061W

0.235W

0.437W

0.563W

0.765W

0.939W

0.926H

0.712H

0.500H

0.288H

0.074H

0.783D

0.847D

0.923D

0.981D

90°

(<10”)

D (>10”)

0.032D

0.135D

0.321D

0.679D

0.865D

0.968D

0.019D

0.077D

0.153D

0.217D

0.361D

0.639D

0.061W

0.235W

0.437W

0.563W

0.765W

0.939W

0.926H

0.712H

0.500H

0.288H

0.074H

0.783D

0.847D

0.923D

0.981D

STA2

UNITS

CLEAR DATA

RECORD MODE

PRESS FOR

1 SECOND

In-Duct

Hot Wire

Anemometer

DUCT

ON/OFF

ENTER

HOLD

AVERAGE

MAX/MIN

AUTO-OFF

STA2

UNITS

CLEAR DATA

RECORD MODE

PRESS FOR

1 SECOND

In-Duct

Hot Wire

Anemometer

DUCT

ON/OFF

ENTER

HOLD

AVERAGE

MAX/MIN

AUTO-OFF

1 2

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Fieldpiece STA2 - In Duct Hot-wire Anemometer User Manual Page 2

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